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-   -   PseudoColor overlay bits (http://www.nvnews.net/vbulletin/showthread.php?t=75487)

begal 08-22-06 03:48 PM

PseudoColor overlay bits
Hi all,

In overlay mode (8 bits pseudocolor + 24 bits truecolor), how come the number of colors in pseudocolor plane is 32 (5 bits).

Is it possible that the overlay is downgrading pseudocolor from 8 bits to 5?

Did I missed some configs in xorg.conf?


AaronP 08-28-06 05:27 PM

Re: PseudoColor overlay bits
Hi begal,

I assume you're talking about visuals that look like this (from xdpyinfo):

    visual id:    0x70
    class:    PseudoColor
    depth:    8 planes
    available colormap entries:    256 per subfield
    red, green, blue masks:    0x0, 0x0, 0x0
    significant bits in color specification:    5 bits

This means that the visual has 8 planes, for a total of 256 colormap entries. Each colormap entry has a depth of 15 bits (5 bits per channel) for a total of 32,768 colors per colormap entry. The reason it's 5 bits per channel and not 8 is because the overlay hardware only supports depth 15.

begal 08-29-06 10:19 AM

Re: PseudoColor overlay bits
My xdpyinfo is the same,

That means that we are stucked with 32 colors in pseudocolor when using overlay mode?

begal 08-29-06 10:25 AM

Re: PseudoColor overlay bits
Is there any cards doing 24 bits overlay ? (8 bits per channel)

angel2 03-22-07 09:13 AM

Re: PseudoColor overlay bits
I'm also looking for a card that can support the full 8 bits in overlay mode. I've got a QUADRO FX 560 but it gives me only 5 significant bits per color. Which NVIDIA cards support the 8 bits/color in overlay mode?

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